JP2002372107A - Manufacturing method for center belt for high load transmission belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a center belt for a high load transmission belt having trim surfaces having a uniform angle and no differences in level. SOLUTION: This high load transmission belt is constituted of a plurality of blocks fitted and fixed along the longitudinal direction of the center belt. In this manufacturing method for the center belt for the high load transmission belt having the trim surfaces having the angles on a block contact surface of the center belt, first grooves 46 for forming the trim surfaces on one surface of a center belt sleeve 45 are provided, second grooves 48 for forming the trim surfaces on the other surface are provided, and the block contact surface of the center belt is formed by subsequently cutting the center belt sleeve 45 into round slices at the first and second groove bottoms 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-load transmission belt used for transmitting a high load such as a continuously variable transmission such as an automobile, a motorcycle or an agricultural machine, in which a block is arranged in a longitudinal direction on a center belt. The present invention relates to a method for manufacturing a center belt, which is capable of improving the accuracy of dimensions and shapes in a portion where a center belt and a block are fitted.

[0002]

2. Description of the Related Art A belt used in a belt-type continuously variable transmission is used by being wound around a speed change pulley that changes the effective diameter of the pulley by changing the V-groove width of the pulley and thereby adjusts the gear ratio. Since the lateral pressure from the pulley increases, the belt must be able to withstand the large lateral pressure. In addition to a continuously variable transmission, a belt capable of withstanding a high load needs to be used for a high load transmission in which the life of a normal rubber belt is too short.

[0003] Among such belts, there is a high-load transmission belt in which a block is fixed to a center belt to increase the strength in the width direction of the belt. A block made of an elastomer that is relatively harder than the elastomer used for the center belt is fixed to a center belt embedded in the elastomer by using a fastening material such as bolts and rivets, As shown in -34342, there is a belt having a groove on both side surfaces of a block, and a pair of center belts fitted in grooves provided on the side surface.

[0004] The center belt used for such a belt is a member that bears tension, and a high-strength, low-elongation core wire is embedded in an elastomer such as rubber, and a block is fitted on the inner and outer peripheral surfaces of the center belt. A concave portion and a convex portion for matching are provided alternately. For example, also in the grooves on both side surfaces of the block, a convex portion is provided at a position corresponding to the concave portion of the center belt, and the block is fitted so that the block does not move in the traveling direction of the high load transmission belt with respect to the center belt. Fixed.

Further, the pulley contact surface of the center belt has an angle corresponding to the V angle of the pulley, and the block contact surface contacting the bottom of the groove of the block is provided with angled trim surfaces at upper and lower ends. , Which are provided both in the groove of the block and in the center belt. The center belt receives side pressure from the pulley and transmits the block to the block at the block contact surface. However, stress is concentrated on the block at the upper and lower ends of the block contact surface, which may lead to cracking. By providing the trim surface as described above, the concentration of stress can be reduced.

[0006]

The method of manufacturing such a center belt is similar to the method of manufacturing a rubber belt. A center wire or a rubber sheet is wrapped around a mold and the inner and outer peripheral surfaces of the belt are manufactured. The uneven portion is cleared by a mold to obtain a wide center belt sleeve. Next, the center belt sleeve is cut into a center belt having a predetermined width by cutting the center belt sleeve, but the center belt is cut with a blade to form a trim surface.

By cutting the center belt around a pulley or the like and rotating it, and inserting the blade into the center belt at a predetermined angle, the angled cut can be easily made, so that the work is simple and good. However, there is a problem that the rubber escapes when cutting, and the cut surface shifts when the cutting tool moves from rubber to the core wire, resulting in a step on the cut surface. Will lead to

[0008] In particular, when the trim surface has a variation in the angle or the trim surface has a step, the center belt protrudes largely from the side surface of the block, the core wire embedded in the center belt is frayed, and the belt slips. There is also a risk that the belt may be broken due to the protrusion of the core wire.

In view of the above, according to the present invention, the block and the center belt are fitted tightly without causing a variation in angle or a step on the trim surface to be fitted into the groove on the side surface of the block.
An object of the present invention is to provide a method of manufacturing a center belt for a high-load power transmission belt, which can prevent the center belt from protruding from the side surface of the block or rattling.

[0010]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a center belt having a core body embedded in an elastomer and a center belt having a fitting groove for the center belt. A high-load transmission belt composed of a plurality of blocks fitted and fixed along the longitudinal direction of the block, wherein the upper and lower ends of the block contact surface of the center belt contacting the fitting groove of the block have trimmed surfaces having angles. In the method of manufacturing a center belt for a high-load transmission belt, the first groove for forming a trim surface is provided on one surface of the center belt sleeve in which the core wire is embedded, and the trim surface is provided on the other surface of the center belt sleeve. Forming a second groove to be formed, and then cutting the center belt sleeve at the bottom of the first and second grooves to thereby block the center belt. A method for producing a high-load transmission belt for center belt comprising the step of forming a contact surface.

According to a second aspect of the present invention, there is provided a high belt comprising a center belt having a core buried in an elastomer, and a plurality of blocks having a fitting groove of the center belt and fitted and fixed along the longitudinal direction of the center belt. In a method for manufacturing a load transmission belt, a center belt for a high-load transmission belt having an angled trim surface at upper and lower ends of a block contact surface of a center belt that is in contact with a fitting groove of a block, wherein a core wire is embedded. A first groove for forming a trim surface is provided on one surface of the center belt sleeve by winding the center belt sleeve around a roll and rotating and bringing the grinding wheel into contact with the center belt sleeve. It is wound around a roll that has a projection that fits with the center belt Forming a second groove forming a trim surface on the other surface of the first belt, and then forming a block contact surface of the center belt by cutting the center belt sleeve at the bottom of the first and second grooves. This is a method for manufacturing a center belt for a power transmission belt.

[0012] As described above, the center belt sleeve is formed with a tapered surface having a trim angle in advance by a grinding wheel, and thereafter the trim surface is formed by a method such as wheel cutting, whereby rubber generated when cutting with a blade is performed. The trim surface can be flattened at a uniform angle because there is no escape of the wire or escape by the core wire.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings.

FIG. 1 is a schematic perspective view showing an example of a high-load transmission belt 1, and FIG. 2 is a cross-sectional view of a center belt used therein. A high-load transmission belt 1 using a center belt manufactured by the method for manufacturing a center belt for a high-load transmission belt of the present invention has the same width as that of a rope-shaped core 5 spirally embedded in an elastomer 4. Two center belts 3a, 3b and this center belt 3
a, 3b are formed with a plurality of blocks 2 fitted and locked and fixed to concave ridges 18, 19 formed on the upper and lower surfaces 24, 25 at a predetermined pitch. Both block side surfaces 2a and 2b of the block 2 are inclined surfaces that engage with the V-grooves of the pulleys.
a, 3b are pulled to transmit the power of the driving pulley to the driven pulley.

As shown in FIG. 1, the block 2 includes an upper beam portion 11 and a lower beam portion 12, and upper and lower beam portions 11,
12 comprises a center pillar 13 connecting the central portions thereof, and a center belt 3 on both sides of the block 2.
a, 3b are formed therein. Also, as shown in FIG. 2, on the upper surface 16 and the lower surface 17 of the groove in the groove 15, there are provided a ridge 18 which engages with a concave portion 18 provided on the upper surface 24 of the center belt 3 and a concave portion 19 provided on the lower surface 25. Part 2
0 and 21 are provided.

The upper beam portion 11 and the lower beam portion 12
And the center pillar 13 are formed with trim surfaces 22 and 23 on the block side.

As shown in FIG. 3, the center belts 3a and 3b have upper and lower surfaces 24 and 25 in contact with the upper beam portion 11 and the lower beam portion 12, a pulley contact surface 26 in contact with the pulley V-groove, and grooves 14 and 15, respectively. Center pillar 1 at the bottom of the groove
The block contact surface 27 is in contact with the block contact surfaces 27. Trim surfaces 28 and 29 are formed at the upper and lower ends of the block contact surface 27 so as to match the block-side trim surfaces 22 and 23, respectively.

In the present invention, the center belts 3a, 3b
In the manufacturing method, the center belt sleeve having the core wire embedded therein is provided with a first groove for forming a trimmed surface on one surface of the center belt sleeve by rotating the center belt sleeve around, for example, a roll and rotating and contacting the polishing wheel, Next, the center belt sleeve is turned upside down, wound around a roll having a projection that fits with the groove, rotated, and brought into contact with a polishing wheel to form a second groove that forms a trim surface on the other surface of the center belt sleeve. The center belt is manufactured by a method in which the center belt sleeve is sliced at a predetermined width.

The production of the center belt sleeve is not particularly limited, and the center belt sleeve can be produced according to a conventional belt production method. For example, a rubber sheet is wound around a mold, a rope serving as a core wire is spirally wound from above, and the rubber sheet is further wound from above. The rubber is vulcanized by applying a predetermined temperature and pressure as described above and covering the jacket with a jacket, and vulcanizing the rubber to obtain a center belt sleeve.

Next, polishing is performed using a polishing apparatus 40 as shown in FIG. The polishing device 40 includes the driving roll 4
1 and a driven roll 4 having a diameter different from that of the drive roll 41
2 and a grinding wheel 43 for forming grooves on the inner and outer peripheral surfaces of the center belt sleeve, and a suction device 44 for collecting and discharging abrasive powder and the like from the center belt sleeve. These are controlled by a control system. Has become.

The drive roll 41 is rotated by a rotating machine (not shown), and runs a belt sleeve 45 stretched between the driven roll 42 and the driven roll 42 at a predetermined tension. Further, the rotation speed of the driving roll 41 and the rotation speed of the driven roll 42 rotated by the belt sleeve 45 may be detected by a detection sensor such as a rotary encoder and output to the control system.

The center belt sleeve 45 is driven and driven rolls 41, 4
The center belt sleeve 45 is caused to run by rotating the drive roll 41 over Step 2. Belt sleeve 4
While the wheel 5 is running, the polishing wheel 43 as shown in FIG. 5 is brought into contact with the center belt sleeve 45 to form the first groove 46 having a predetermined depth (FIG. 6). The polishing powder generated by the polishing is removed from the center belt sleeve 45 by the rotating brush 47, collected by the suction device 44, and discharged to the outside of the polishing device 41.

When the formation of the first groove 46 by polishing is completed, the center belt sleeve 45 is once removed from the driving and driven rolls 41 and 42 and turned over. continue,
The inverted center belt sleeve 45 is again run around the drive and driven rolls 41 and 42 to run. Then, by bringing the polishing wheel 43 into contact with the center belt sleeve 45, a second groove 48 is formed on the other surface at the same position as the first groove 46 (FIG. 7).

Since the angle of the polishing portion 49 of the polishing wheel 43 is equal to the angle of the trim surfaces 28 and 29 of the center belt, the trim surface 2 is provided in the first and second grooves 46 and 48.
8, 29 are formed.

Next, with the center belt sleeve 45 rotated, the groove bottoms 5 of the first and second grooves 46 and 48 are formed.
By inserting the cutter vertically into the center 0, a block contact surface 27 of the center belt having trim surfaces 28 and 29 on the upper and lower sides is formed. Then, the cutter is cut at a predetermined distance from the block contact surface with the same angle as the V-groove angle of the pulley, whereby the pulley contact surface 26 of the center belt can be formed. Alternatively, in the case of using a belt as shown in FIG. 8, which will be described later, cutting is performed without making an angle.

By forming the trim surface by the above-described method, the trim surface which has been conventionally angled by using a cutter or the like becomes extremely accurate. By using such a center belt, the fitting of the block with the block is also performed with high accuracy, so that problems such as rattling between the block and the center belt and protrusion of the center belt from the block due to irregular dimensions are prevented. This makes it possible to reduce running disturbance and noise even as a high-load transmission belt, which can contribute to a longer life and the like.

As a method of polishing the center belt sleeve, a method has been described in which one side is polished and then turned over and the other side is polished. However, the method is not limited to this, and a method in which both sides are polished at once may be used. According to the present invention, it is possible to obtain a center belt having a trim surface without a change in angle or a step by polishing and forming trim surfaces 28 and 29 before cutting in a circle when forming the block contact surface 27 of the center belt. It is a feature, and any manufacturing method satisfying this condition is included in the scope of the present invention.

FIG. 8 shows another example of a belt to which the center belt obtained by the manufacturing method of the present invention can be applied. A pair of side pillars 32, 33 is formed from both ends of a beam portion 31 upward. This side pillar 3 is extended
Lock portions 34 and 35 extending from the upper ends of the blocks 2 and 33 toward the center of the block 2 are provided so as to face each other. And these beam parts 31 and side pillars 3
A fitting groove 30 into which the center belts 3a, 3b fit is formed by the lock portions 2, 33 and the lock portions 34, 35.
The center belts 3a and 3b are inserted into the fitting grooves 30 through the openings between the lock portions 34 and 35, and are mounted. Also, the protrusions 37 are provided on the fitting groove 30 side of the lock portions 34 and 35.
Are provided, and the convex portions 37 are provided in the concave portions 3 provided on the center belts 3a and 3b at a predetermined pitch.
6 is fitted. Thereby, the center belts 3a, 3
b is in a state in which it is hard to fall out of the block 2 after mounting.

In the case of a belt having such a structure, the trim surfaces 38 and 39 of the center belt are disposed outside.

In the present invention, either a block in which an insert material such as an aluminum alloy is embedded in the block or a block in which no insert material is embedded can be used.

As the resin for the block, polyamide resin, polyamideimide (PAI) resin, polyphenylene sulfide (PPS) resin, polybutylene terephthalate (PBT) resin, polyimide (P
I) Synthetic resins such as resin, polyethersulfone (PES) resin and polyetheretherketone (PEEK) resin are used. Above all, they have a low coefficient of friction, have excellent wear resistance, are rigid, and have elasticity against bending. A resin having properties and not being easily damaged is preferable, and a polyamide resin, especially nylon 46, is preferable.

In the present invention, it is possible to incorporate a fibrous reinforcing material or a whisker-like reinforcing material into the synthetic resin forming the block as described above.
It is blended in the range of 0% by weight. If the amount is less than 15% by weight, there is a problem that the reinforcing effect is small and the abrasion resistance of the block is not sufficient. If the amount is more than 40% by weight, it becomes difficult to mix the resin with the resin and injection molding becomes difficult. It is not preferable because there is a problem.

Examples of the fibrous reinforcing material to be added to the synthetic resin include aramid fiber, carbon fiber, glass fiber, polyamide fiber, polyester fiber and the like. Among them, by using a combination of nylon 46 and carbon fiber, which are preferable examples of the resin constituting the block, the carbon fiber improves the water absorbing defect of nylon 46, and the rigidity can be greatly improved. In addition, the wear resistance, impact resistance and fatigue resistance of nylon 46 can be utilized. Among carbon fibers, it is preferable to use PAN-based carbon fibers. Further, by blending the aramid fiber in combination with the carbon fiber, the toughness of the block is improved, and the wear resistance and impact resistance can be further improved.

Here, the PAN-based carbon fiber used is:
Good compatibility with thermoplastic resin, length of carbon fiber used is 1
５5 mm is preferred. If it is less than 1 mm, the block is not sufficiently reinforced, and if it exceeds 5 mm, kneading with the resin becomes difficult, and the kneading becomes shorter during kneading, which is not preferable.

As the fibrous reinforcing material, inorganic fibers such as zinc oxide whiskers, potassium titanate whiskers, and aluminum borate whiskers may be blended in addition to the above organic fibers. Among these, it is preferable to use zinc oxide whiskers. The zinc oxide whisker has a three-dimensional shape in which hands extend in four directions like a tetrapod. This zinc oxide whisker alone is excellent in heat resistance and abrasion resistance, but has a tetrapod-like three-dimensional shape as described above. Is suppressed, and the anisotropy of warpage and molding shrinkage during molding is improved. Further, since the orientation of the carbon fibers can be reduced in this way, the anisotropy in strength such as the toughness and bending stiffness of the block 2 can be reduced, and the friction coefficient is stabilized, so that the wear resistance is improved. I do.

Further, since the zinc oxide whisker has a high specific gravity and a high rigidity, the vibration at the time of contact with the pulley can be reduced, and the generation of noise can be reduced. When the amount of the zinc oxide whisker is small, the effect of the addition is not exhibited. When the amount is too large, kneading cannot be performed, and molding becomes difficult.

By adopting such a material constitution,
It has strength such as rigidity and toughness enough to withstand the side pressure received when it comes into contact with the pulley, and has excellent wear resistance,
Furthermore, it is possible to make the block strong against heat generated at the time of friction, and it is possible to efficiently transmit the power received from the pulley to the center belts 3a and 3b as a tensile force. Can be configured.

In addition to these, molybdenum disulfide,
The lubricity of the block 2 can also be improved by mixing at least one selected from graphite and a fluorine-based resin. Examples of the fluorine-based resin include polytetrafluoroethylene (PTFE), polyfluoroethylene propylene ether (PFPE), tetrafluoroethylene hexafluoropropylene copolymer (PFEP), and polyfluoroalkoxyethylene (PFA). .

The material used as the elastomer 4 of the center belts 3a and 3b may be a single material such as chloroprene rubber, natural rubber, nitrile rubber, styrene-butadiene rubber, hydrogenated nitrile rubber, or a rubber or polyurethane appropriately blended with them. Rubber and the like. As the core 5, a rope selected from polyester fiber, polyamide fiber, aramid fiber, glass fiber, steel wire, or the like is used. The core body 5 may be made of a woven cloth, a knitted cloth, a thin metal plate, or the like made of the above-described fiber, in addition to the rope in which the rope is embedded in a spiral shape.

The block used in the high-load transmission belt according to the present invention is not limited to the form shown in the present embodiment.

[0041]

Next, a high-load transmission belt using the center belt obtained by the manufacturing method of the present invention and a conventional center belt was prepared, and a running test was performed using each belt to compare the performance. Was.

(Example) A hydrogenated nitrile rubber was used as the elastomer for the center belt, a rope made of aramid fiber was embedded spirally in the elastomer for the core, and the block contact surface was used as the manufacturing method. Is formed by polishing, and thereafter, is cut into a single center belt. A center belt was attached to the block to obtain a high-load transmission belt as shown in FIG. As the material of the block, a mixture of 30 parts by weight of carbon fiber and 100 parts by weight of nylon 46 was used.

Using the obtained belt, the belt was run under the conditions shown in Table 1 to measure the endurance time, and the failure phenomenon was observed.

Comparative Example A high-load transmission belt was prepared under the same conditions as in the example except that the center belt was manufactured using a center belt formed by cutting with a cutting tool.

Using the obtained belt, a running test was carried out in the same manner as in the example, the durability time was measured, and the failure phenomenon was observed.
Table 2 shows the results.

[0046]

[Table 1]

[0047]

[Table 2]

As can be seen from the results in Table 2, the belt of the example has a long service life, whereas the comparative example has a short service life, and the failure phenomenon is also the destruction of the center belt due to the protrusion of the core wire. It has become. This is presumed to be due to the poor precision of the trim surface of the center belt, the protrusion of the center belt on the side surface of the block, and the occurrence of rattling.

[0049]

As described above, according to the first aspect of the present invention, the center belt having the core buried in the elastomer and the fitting groove of the center belt are fitted and fixed along the longitudinal direction of the center belt. Manufacture of a high-load transmission belt comprising a plurality of blocks, the center belt for a high-load transmission belt having angled trim surfaces at upper and lower ends of a block contact surface of a center belt in contact with a fitting groove of the block. The method further comprises providing a first groove forming a trim surface on one surface of the center belt sleeve having the core wire embedded therein, and providing a second groove forming a trim surface on the other surface of the center belt sleeve. High load transmission including the step of forming a block contact surface of the center belt by slicing the center belt sleeve at the first and second groove bottoms. It is a method of manufacturing a belt for the center belt.

According to a second aspect of the present invention, there is provided a high belt comprising a center belt having a core buried in an elastomer, and a plurality of blocks having a fitting groove of the center belt and fitted and fixed along the longitudinal direction of the center belt. In a method for manufacturing a load transmission belt, a center belt for a high-load transmission belt having an angled trim surface at upper and lower ends of a block contact surface of a center belt that is in contact with a fitting groove of a block, wherein a core wire is embedded. A first groove for forming a trim surface is provided on one surface of the center belt sleeve by winding the center belt sleeve around a roll and rotating and bringing the grinding wheel into contact with the center belt sleeve. It is wound around a roll that has a projection that fits with the center belt Forming a second groove forming a trim surface on the other surface of the first belt, and then forming a block contact surface of the center belt by cutting the center belt sleeve at the bottom of the first and second grooves. This is a method for manufacturing a center belt for a power transmission belt.

As described above, the center belt sleeve is formed in advance with a taper surface having a trim angle by a grinding wheel, and thereafter the trim surface is formed by a method such as wheel cutting, whereby rubber generated when cutting with a blade is performed. The trim surface can be flattened at a uniform angle because there is no escape of the wire or escape by the core wire.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an example of a high-load transmission belt according to the present invention.

FIG. 2 is a side sectional view of a high-load transmission belt.

FIG. 3 is a sectional view of a center belt.

FIG. 4 is a schematic diagram of a polishing apparatus.

FIG. 5 is a sectional view of a polishing wheel.

FIG. 6 is a cross-sectional view showing a state where a first groove is provided in a center belt sleeve.

FIG. 7 is a cross-sectional view of a center belt sleeve in which a second groove is provided.

FIG. 8 is a schematic perspective view showing another example of the high-load transmission belt according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High load transmission belt 2 Block 3a Center belt 3b Center belt 4 Elastomer 5 Core body 11 Upper beam part 12 Lower beam part 13 Center pillar 14 Fitting groove 15 Fitting groove 26 Pulley contact surface 27 Block contact surface 28 Trim surface 29 Trim Surface 40 Polishing device 43 Polishing wheel 44 Suction unit 45 Center belt sleeve 46 First groove 48 Second groove 49 Polishing unit 50 Groove bottom

Claims (2)

[Claims] 1. A high-load transmission belt comprising a center belt having a core embedded in an elastomer, and a plurality of blocks having a fitting groove of the center belt and fitted and fixed along the longitudinal direction of the center belt. A method of manufacturing a center belt for a high-load power transmission belt having an angled trim surface at upper and lower ends of a block contact surface of a center belt in contact with a fitting groove of a block. A first groove for forming a trim surface is provided on one surface of the center belt sleeve, and a second groove for forming a trim surface is provided on the other surface of the center belt sleeve, and then a center is formed at the bottom of the first and second grooves. A method of manufacturing a center belt for a high-load transmission belt including a step of forming a block contact surface of a center belt by cutting a belt sleeve. Law. 2. A high-load transmission belt comprising a center belt in which a core is embedded in an elastomer, and a plurality of blocks having a fitting groove of the center belt and fitted and fixed along the longitudinal direction of the center belt. A method of manufacturing a center belt for a high-load power transmission belt having an angled trim surface at upper and lower ends of a block contact surface of a center belt in contact with a fitting groove of a block. A first groove for forming a trim surface on one surface of the center belt sleeve by rotating the roller around a roll to abut the polishing wheel, and then turning over the center belt sleeve to fit the groove The roller is wound around a roll having Providing a second groove forming a memory surface,
A method of manufacturing a center belt for a high-load power transmission belt, comprising a step of forming a block contact surface of the center belt by slicing the center belt sleeve at the bottoms of the first and second grooves.